
You may have hear about Intimacy on Oprah or What Not to Wear, but if you haven't now is your chance. A their stores in select cities, a specialist will meet with you and help you find the right European-sized bra. You see with European bras the band number is the actual measurement around your ribcage. The cup size depends upon the size of your breasts, of course.
A proper bra will be snug. The band will carry most of the weight, not the straps, and it will touch your breastbone. Your breasts will be lifted, your clothes will fit better, and the line of your back will be much improved (I hate that bra-bulge one can sometimes get).
I'm sure other stores besides Intimacy can help you with sizing, but it's the only on I know of. However, once you find the right size, you can purchase many styles online. My favorite brand is Fantasie. They will run you $40-100+ and they are well worth the price. A Gilligan & O'Malley bra from Target costs $10 for a reason.
You can find Fantasie and other European brands here:
One more thing, when you find the perfect bra, take care of it. Don't throw it in the washer. Hand wash it with a gentle cleaner like Forever New Fabric Care.